Variation in egg size and offspring phenotype among and within seven Arctic charr morphs
Beck, S. V., Räsänen, K., Kristjánsson, B. K., Skúlason, S., Jónsson, Z. O., Tsinganis, M., & Leblanc, C. A. (2022). Variation in egg size and offspring phenotype among and within seven Arctic charr morphs. Ecology and Evolution, 12(10), Article e9427. https://doi.org/10.1002/ece3.9427
Published in
Ecology and EvolutionAuthors
Date
2022Copyright
© 2022 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.
Maternal effects have the potential to alter early developmental processes of offspring and contribute to adaptive diversification. Egg size is a major contributor to offspring phenotype, which can influence developmental trajectories and potential resource use. However, to what extent intraspecific variation in egg size facilitates evolution of resource polymorphism is poorly understood. We studied multiple resource morphs of Icelandic Arctic charr, ranging from an anadromous morph—with a phenotype similar to the proposed ancestral phenotype—to sympatric morphs that vary in their degree of phenotypic divergence from the ancestral anadromous morph. We characterized variation in egg size and tested whether egg size influenced offspring phenotype at early life stages (i.e., timing of- and size at- hatching and first feeding [FF]). We predicted that egg size would differ among morphs and be less variable as morphs diverge away from the ancestral anadromous phenotype. We also predicted that egg size would correlate with offspring size and developmental timing. We found morphs had different egg size, developmental timing, and size at hatching and FF. Egg size increased as phenotypic proximity to the ancestral anadromous phenotype decreased, with larger eggs generally giving rise to larger offspring, especially at FF, but egg size had no effect on developmental rate. The interaction between egg size and the environment may have a profound impact on offspring fitness, where the resulting differences in early life-history traits may act to initiate and/or maintain resource morphs diversification.
...
![showless](/themes/JYX2//images/showless.png)
![showmore](/themes/JYX2//images/showmore.png)
Publisher
WileyISSN Search the Publication Forum
2045-7758Keywords
Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/159234970
Metadata
Show full item recordCollections
Additional information about funding
This research was funded by the Icelandic Research Fund (grant numbers 141360 and 173814-051).License
Related items
Showing items with similar title or keywords.
-
Variation in parasite resistance of Arctic charr, Salvelinus alpinus, between and within sympatric morphs
Karvonen, Anssi; Beck, Samantha V.; Skúlason, Skúli; Kristjánsson, Bjarni K.; Leblanc, Camille A. (Wiley-Blackwell, 2021)Genetic variation in resistance against parasite infections is a predominant feature in host–parasite systems. However, mechanisms maintaining genetic polymorphism in resistance in natural host populations are generally ... -
Early-life environmental effects on birds : epigenetics and microbiome as mechanisms underlying long-lasting phenotypic changes
Ruuskanen, Suvi (The Company of Biologists, 2024)Although the long-lasting effects of variation in early-life environment have been well documented across organisms, the underlying causal mechanisms are only recently starting to be unraveled. Yet understanding the ... -
Maternally‐transferred thyroid hormones and life‐history variation in birds
Hsu, Bin‐Yan; Pakanen, Veli‐Matti; Boner, Winnie; Doligez, Blandine; Eeva, Tapio; Groothuis, Ton G. G.; Korpimäki, Erkki; Laaksonen, Toni; Lelono, Asmoro; Monaghan, Pat; Sarraude, Tom; Thomson, Robert L.; Tolvanen, Jere; Tschirren, Barbara; Vásquez, Rodrigo A.; Ruuskanen, Suvi (Wiley-Blackwell, 2022)1. In vertebrates, thyroid hormones (THs) play an important role in the regulation of growth, development, metabolism, photoperiodic responses and migration. Maternally transferred THs are important for normal early-phase ... -
Rich resource environment of fish farms facilitates phenotypic variation and virulence in an opportunistic fish pathogen
Pulkkinen, Katja; Ketola, Tarmo; Laakso, Jouni; Mappes, Johanna; Sundberg, Lotta‐Riina (Wiley-Blackwell, 2022)Phenotypic variation is suggested to facilitate the persistence of environmentally growing pathogens under environmental change. Here we hypothesized that the intensive farming environment induces higher phenotypic variation ... -
Genetic colour variation visible for predators and conspecifics is concealed from humans in a polymorphic moth
Nokelainen, Ossi; Galarza, Juan A.; Kirvesoja, Jimi; Suisto, Kaisa; Mappes, Johanna (Wiley-Blackwell, 2022)The definition of colour polymorphism is intuitive: genetic variants express discretely coloured phenotypes. This classification is, however, elusive as humans form subjective categories or ignore differences that cannot ...